<s>
two	O
or	O
more	O
identical	O
woofers	B-Device
(	O
bass	O
drivers	O
)	O
operate	O
simultaneously	O
,	O
with	O
a	O
common	O
body	O
of	O
enclosed	O
air	O
adjoining	O
one	O
side	O
of	O
each	O
diaphragm	O
.	O
</s>
<s>
In	O
a	O
subwoofer	B-Application
,	O
where	O
the	O
mid-range	O
output	O
is	O
not	O
needed	O
,	O
the	O
optimum	O
arrangement	O
is	O
front	O
to	O
front	O
,	O
i.e.	O
</s>
